/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/Graph/MovieGraphConfig.h
A variable that can be used inside the graph. Most variables are created by the user, and can have their value changed at the job level. Global variables, however, are not user-created and their values are provided when the graph is evaluated. Overriding them at the job level is not possible.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class UMovieGraphVariable : public [UMovieGraphMember](API\Plugins\MovieRenderPipelineCore\Graph\UMovieGraphMember)
FOnMovieGraphVa...
OnMovieGraphVariableChangedDelegate